Studies conducted at the Toxic Hazard Research Unit have analyzed trimer and tetramer carboxylic acid metabolites of polychlorotrifluoroethylene (pCTFE) in biological samples. Tissue samples have been stored at -70 deg C, and urine and feces have been stored at -20 deg C for periods of time ranging from several months to over 1 year. At the time of these analyses, the storage stability of the carboxylic acid metabolites of pCTFE ...
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